Allow importing data from Firefox profiles

[TWonderAlmighty]

While you can copy or use a Firefox profile in other copies of Firefox and perhaps Beta, Nightly, or Dev Edition, an issue is when you use a profile from an older Firefox version in a newer one, then you can't use the profile in the older Firefox. It usually takes a long time to move addon data to or from Firefox Forks including Floorp and Zen Browser. Allowing imports from other Firefox profiles in the "Import data from another browser" UI, would help with both of those.

[Jon]

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